Sow indoors, January-April. A warm kitchen windowsill is all you need for starting these seeds. Sow thinly on the surface of a small tray of pre-watered compost. Place in a warm, light position. A temperature of 15-20°C (60-68°F) is ideal. Keep the compost moist. The tray can be covered with clingfilm to preserve humidity, but remove when seedlings appear, usually in 14-21 days. Transplant them, in tiny clumps, 5cm (2") apart, to other trays when large enough to handle. Grow on in cooler, but not cold conditions. Gradually accustom young plants to outside conditions (avoid frosts), before planting out, May-June, 15cm (6") apart, into well-drained soil, when frosts are over. Flowers: June-October.

Trim back plants, after the first flush of blooms fades, to encourage further flowering.

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